Question

The ratio of various ingredients (cement, sand, aggregate) in concrete of grade M 15 is _______

• A. 1 : 2 : 4
• B. 1 : 3 : 6
• C. 1 : 1.5 : 3
• D. 1 : 1 : 2

Answer 1

The correct option is A 1 : 2 : 4

Mix proportions of cement concrete -

Grade of concrete	M 15	M 20	M 25
Mix proportion	1 : 2 : 4	1 : 1.5 : 3	1 : 1 : 2
Characteristic strength (MPa)	15	20	25

Note : IS : 456 restricts the use of nominal mix up to M-20 grade only.